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(No Model.) 7

. 'J. TOLHURST.

GATBVALVE. No. 594,045. Patented Nov. 23

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PATENT EEICE.

BURLINGTON, CANADA.

GATE-VALVE.

SPECIFICATION forming part of Letters Patent N 0. 594,045,.dated November 23, 1897.

Application filed March 3 1, 1 8 9 7.

To aZZ whom it may concern:

Be it known that I, JOSEPH TOLHURST, a citizen of Canada, residing at Burlington, in thecounty of Halton and Province of Ontario, Canada, have invented new and useful Improvements in Gate-Valves, of which the following is a specification.

My invention relates to improvements in the waterway of a gate-valve; and it consists of an adjustable protector against the lodgment of substance in the Waterway in order to allow free and perfect operation of the valve in the lower part of its chamber.

The objects of my invention are, first,to provide a gate-valve so arranged and devised as to prevent anything of an obstructive nature from finding a secure lodgment in the valvechamber that would interfere with the functions of the valve, and, second, to afford facilities for the proper adjustment of a valve or chamber protector in relation to the adjustment of the valve proper. I attain these objects by the mechanism illustrated in the accompanying drawings, in which- Figure 1 is a front elevation of the gatevalve in its completeness, the important part being in section. Fig. 2 is a side elevation in section of the principal part of the same, and Fig. 3 shows front and side elevations in section of the detached valve and chamber protector.

Similar letters and figures refer to similar parts throughout the several views.

The ordinary shell of the gate-valve is indicated by A, the adjustable valve by B, and the valve and chamber protector by 0. It will be noticed that this protector O is located in the lower part of the valve-chamber, in that part which the lower part of the adjustable valve enters when in its lowest position in order to close the waterway. The water inlet and outlet is through either of the central openings of the outer flanges 2 and the openings or waterways 3, which are formed in the walls of the valve-chamber, said walls being a guide for the operation of the vertically-adjustable valve. This valve 13 is larger in diameter than the diameters of the said waterways, and in order to cut off the water-supply the valve is brought down until the Waterways 3 are closed by the said valve. At this time the lower and circular. part of the Serial No. 630,095. (No model.)

valve engages with the concaved face of the protector O and presses the same down upon its base-supporting spring D, which rests upon the lower part of the chamber, and in a socket 4:. A similar socket 5 is on the base of the protector C to prevent any possibility of the spring leaving its proper position. A stop 6 and a removable stop 7 at the upper part of this protector prevents the same from leaving its proper position-that is, in the position delineated,with its concaved part perfectly flush or waterways 3. This is the important element in my invention, therefore, in the con struction thereof. The stop 7, referred to, is removable in order to admit the protector.

It will be observed that in a valve of this class a lower chamber is necessary to admit the lower part of the valve in order to fully .cover and close the waterways 3. My purpose .is to deepen this chamber in order to admit a protector and spring. The object of the protector is to be flush with the waterways in order to prevent any obstacles-such as pebbles, stones, and the like-from finding a lodgment in the cavity formed between the walls of the valve and the lower part of the chamber. This feature is very important, as it allows the valve to perform its function. In the ordinary gate-valves without this protector stones and other matter have lodged in the cavity referred to and prevented the proper discharge of the functions of the valve. A tap E is connected to the lower part of the valve-chambers as an outlet for any possible accumulation of sand and the like, in order to afford free operation of the protector.

tion or the general design ofthe gate-valve, nor to the operating mechanism, such as the valve with spindle, the caps or glands through which said spindle operates by means of an upper wheel, all these being common.

Having now particularly described the object and nature of my invention, what I-desire to secure by Letters Patent is A gate-valve having through waterways, a vertically-operating valve between said waterways to fully stop the same, a lower chamber formed to admit the lower part of the valve, and to admit an independent protector, said protector of semicircular form and with the lower circular part of the openings I make no claim to the particular construe waterways by means of a spring engaging with the lower convex part of the protector, a rigid stop and a removable stop in the walls of the valve-chamber to act against the force of the said spring, to retain the protector in I0 position, as described.

JOSEPH TOLHURST.

Witnesses:

JOHN H. IIENDRY, B. E. HERALD. 

